/**
 * ORIPA - Origami Pattern Editor
 * Copyright (C) 2013-     ORIPA OSS Project  https://github.com/oripa/oripa
 * Copyright (C) 2005-2009 Jun Mitani         http://mitani.cs.tsukuba.ac.jp/

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package oripa.domain.paint.angle;

import java.util.ArrayList;
import java.util.Collection;

import javax.vecmath.Vector2d;

import oripa.domain.paint.PaintContext;
import oripa.domain.paint.core.SnapPointFactory;
import oripa.geom.Segment;

/**
 * @author OUCHI Koji
 *
 */
class AngleSnapPointFactory {
	public Collection<Vector2d> createSnapPoints(final PaintContext context) {
		var step = context.getAngleStep();
		var paperSize = context.getCreasePattern().getPaperSize();

		var crossPoints = new ArrayList<Vector2d>();

		var sp = context.peekVertex();
		for (int i = 0; i < step.getDivNum() * 2; i++) {
			double angle = i * step.getRadianStep();
			double dx = paperSize * 4 * Math.cos(angle);
			double dy = paperSize * 4 * Math.sin(angle);
			var line = new Segment(sp.x, sp.y,
					sp.x + dx, sp.y + dy);

			var snapPointFactory = new SnapPointFactory();

			crossPoints.addAll(snapPointFactory.createSnapPoints(context, line));
		}

		return crossPoints;
	}
}
